视频导出、时间轴与动作姿势模块

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- 视频导出：WebCodecs 逐帧快速导出 MP4（固定分辨率不随视口布局变形），MediaRecorder 兜底
- 时间轴：面板可拖动调高（持久化、固定上限）、关键帧轨道区内滚动、无横向滚动条
- 动作模块：走路/跑步步态曲线（对侧摆臂修复、跑步独立步频、跑姿屈膝曲线、参考校准参数）
- 姿势调节：两级折叠分组、动作偏移联动
- 删除对象时同步清理时间轴轨道

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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LXXandClaude Fable 5 committed 2026-09-02 10:36:03 +08:00

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